linux-kernel - Re: [PATCH v6 1/3] dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code

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Message-ID: <8769f323-fbff-bd75-a1f5-7ec789639b82@salutedevices.com>
Date: Mon, 13 May 2024 13:10:34 +0300
From: Arseniy Krasnov <avkrasnov@...utedevices.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>, Richard Weinberger
	<richard@....at>, Vignesh Raghavendra <vigneshr@...com>, Rob Herring
	<robh+dt@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, Neil
 Armstrong <neil.armstrong@...aro.org>, Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>, Martin Blumenstingl
	<martin.blumenstingl@...glemail.com>
CC: <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-amlogic@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <oxffffaa@...il.com>, <kernel@...rdevices.ru>
Subject: Re: [PATCH v6 1/3] dt-bindings: mtd: amlogic,meson-nand: support
 fields for boot ROM code

Changelog:

v5 -> v6:

* Update description in 'yaml' and commit message by adding more details
  about such special Meson mode. R-b was removed so.

Thanks, Arseniy

On 08.05.2024 02:09, Arseniy Krasnov wrote:
> Boot ROM code on Meson requires that some pages on NAND must be written
> in special mode: "short" ECC mode where each block is 384 bytes and
> scrambling mode is on. Such pages are located on the chip in the
> following way (for example):
> 
> [ p0 ][ p1 ][ p2 ][ p3 ][ p4 ][ p5 ][ p6 ][ p7 ] ... [ pN ]
>   ^           ^           ^           ^
> 
> pX is page number "X". "^" means "special" page used by boot ROM - e.g.
> every 2nd page in the range of [0, 7]. Step (2 in example is set by
> 'amlogic,boot-page-step' field. Last page in range (7 in example) is
> set by 'amlogic,boot-pages' field.
> 
> Signed-off-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
> ---
>  .../bindings/mtd/amlogic,meson-nand.yaml       | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> index 57b6957c8415..284f0f882c32 100644
> --- a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> +++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> @@ -64,11 +64,29 @@ patternProperties:
>          items:
>            maximum: 0
>  
> +      amlogic,boot-pages:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description:
> +          Number of pages starting from offset 0, where a special ECC
> +          configuration must be used because it is accessed by the ROM
> +          code. This ECC configuration uses 384 bytes data blocks.
> +          Also scrambling mode is enabled for such pages.
> +
> +      amlogic,boot-page-step:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description:
> +          Interval between pages, accessed by the ROM code. For example
> +          we have 8 pages [0, 7]. Pages 0,2,4,6 are accessed by the
> +          ROM code, so this field will be 2 (e.g. every 2nd page). Rest
> +          of pages - 1,3,5,7 are read/written without this mode.
> +
>      unevaluatedProperties: false
>  
>      dependencies:
>        nand-ecc-strength: [nand-ecc-step-size]
>        nand-ecc-step-size: [nand-ecc-strength]
> +      amlogic,boot-pages: [nand-is-boot-medium, "amlogic,boot-page-step"]
> +      amlogic,boot-page-step: [nand-is-boot-medium, "amlogic,boot-pages"]
>  
>  
>  required: